Graphics card not working at all

I've had this PC for around three and a half years, I put it together myself.

I had this problem a few years ago, where when I would be playing a game (Say H1Z1 for instance)
My monitor would go completely black, and it'd display the message 'no signal' it would happen
every day I was playing games. I still don't know what the cause of the issue is,
I remember thinking it was either something to do with the PSU or the Graphics Card.
I can't remember what I did, but all of a sudden the problem
seemed to sort itself out.

Now, it's recurring again, although it seems to have come back stronger this time.
Up until the other day I could play Fortnite fine with no errors, then I got the dreaded black screen
followed up with me having to restart the computer using the power off and on button.
In the event viewer this would always display as 'Critical Kernel-Power 41 (63)

This has been happening every day, I thought at first it was Fortnite but having tried to
play Overwatch, I realise it's actually a problem with my Computer. The main issue right now
seems to be the Graphics Card, currently. I'm not even doing anything but typing this out
and the Graphics Card metal pipes are red hot to touch and the fans aren't spinning.
Also the Computer isn't even recognising the Graphics Card (dxdiag just says Basic Display Driver)
but my DVI cable is plugged into the Graphics Card so I don't know how it's displaying
onto my monitor.

Is my Graphics Card completely knackered?

Really appreciate any help I can get on this, causing me lots of stress